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A094648 as a simple table

na(n)
03
1-1
25
3-4
413
5-16
638
7-57
8117
9-193
10370
11-639
121186
13-2094
143827
15-6829
1612389
17-22220
1840169
19-72220
20130338
21-234609
22423065
23-761945
241373466
25-2474291
264459278
27-8034394
2814478659
29-26088169
3047011093
31-84708772
32152642789
33-275049240

[3,-1,5,-4,13,-16,38,-57,117,-193,370,-639,1186,
 -2094,3827,-6829,12389,-22220,40169,-72220,130338,
 -234609,423065,-761945,1373466,-2474291,4459278,
 -8034394,14478659,-26088169,47011093,-84708772,
 152642789,-275049240]